Work samples


Year 7


Mixtures and solutions

Summary of task

Prior to the sample task, students investigated different types of mixtures and had been instructed on the scientific terminology used to describe their components. They had been given opportunities to identify solvent and solute in solutions and to use a range of separation techniques, including filtration, decantation, evaporation and chromatography.

In this task, students were asked to complete a worksheet posing two challenges related to mixtures: (1) solve a specific separation problem, and (2) explain a common mixture-related phenomenon.

Achievement standard

By the end of Year 7, students describe techniques to separate pure substances from mixtures. They represent and predict the effects of unbalanced forces, including Earth’s gravity, on motion. They explain how the relative positions of Earth, the sun and moon affect phenomena on Earth. They analyse how the sustainable use of resources depends on the way they are formed and cycle through Earth systems. They predict the effect of human and environmental changes on interactions between organisms and classify and organise diverse organisms based on observable differences. Students describe situations where scientific knowledge from different science disciplines and diverse cultures has been used to solve a real-world problem. They explain possible implications of the solution for different groups in society.

Students identify questions that can be investigated scientifically. They plan fair experimental methods, identifying variables to be changed and measured. They select equipment that improves fairness and accuracy and describe how they considered safety. Students draw on evidence to support their conclusions. They summarise data from different sources, describe trends and refer to the quality of their data when suggesting improvements to their methods. They communicate their ideas, methods and findings using scientific language and appropriate representations.

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